Resources Contact Us Home
Control system for permanent magnet synchronous motor

Image Number 14 for United States Patent #5854547.

To provide a control system for a permanent magnet synchronous motor which can ensure stability of the current control system, even if the revolution frequency of the motor becomes higher and the terminal voltage of the motor exceeds the inverter maximum output voltage. In this method, when the revolution frequency of the motor exceeds a specified value, the size of the voltage vector is made a specified voltage vector, and a modulation factor based on its value is obtained. At the same time, a magnetic flux direction current correction value is found based on the size of a voltage vector from a polarity coordinates conversion unit and the above specified voltage vector size. Then, the magnetic flux direction current instruction is corrected by that value.

  Recently Added Patents
Tris-quaternary ammonium salts and methods for modulating neuronal nicotinic acetylcholine receptors
Alternative transport mechanism selection
Haptic feedback device and electronic device
Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load estimation
Method of reducing cell death by administering a paracrine factor of a mesenchymal stem cell
Calculation of soft values for uplink communication
Biological materials and uses thereof
  Randomly Featured Patents
Method and apparatus for bottle recirculation
Dual-sized disk player
Slack adjusters
Video demultiplexing based on meaningful modes extraction
Data processing system
Non-aqueous electrolyte secondary cell
Apparatus for inspection of a wafer
Apparatus for contacting solids in the form of freeflowing lumps with liquids or gases
Automatic drift compensation method and device for position-loop controller
3,5-Ditertiary alkyl-4-hydroxyphenyl (alkyl) 6-acyloxy-4-thia hexanoates and hexenamides as antioxidants